Question about Imperial Commercial Cooking Equipment IDR-2-RG24 Stainless Steel Range

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Oven has small explosion igniting and going off. says tj

Acts like a small gas build up before it lights and ignites with a small boom same as when oven goes off.

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A few years back I helped a neighbor with this same problem in a forced air, gas fired, "horizontal" furnace in his attic.

After having him cycle the thermostat a couple dozen times while I watched through the opening in the side of the furnace, I finally figured out what was happening.

First, there were about 6 cast iron burners [about 14 inches long with two rows of gas holes along the length]. These burners were parallel to each other and oriented perpendicular to the long axis of the furnace.

The gas was fed to the ends of the burners with a pipe manifold. The standing pilot light was at the center between burners 3 and 4. Due to the spacing distance between the burners, the pilot light was too far from even burners 3 and 4, the flame could not "jump" to ignite them, or any of the other burners. The manufacturer had installed a thin sheet metal "tent" which ran from the gas entrance end of burner 1 to burner 6, and was about 2 inches above the burner, AND the pilot light.

The standing pilot was on all the time. When the gas control valve turned on, gas began to come out of all the burners at the same time. Naturally it came out of the gas supply manifold ends of all the burners.

The "tent" captured that gas coming from the burners and "filled" up to over the pilot light which ignited the gas at that point, and the flame would propagate along the tent to ignite the gas coming out of all of the burners.

In my neighbors case, the tent had somehow become dislodged so that it did not cover all of the burner ends. For those burners which it did cover [including the pilot light] it caused the burners to light properly.

For those burners who's ends were not covered, and who's gas could not be captured, they would NOT ignite simultaneously with the others.

As these burners WERE feeding gas into the combustion chamber, the gas "envelope" would spread until it reached the nearest flame ignition source, at which time the entire "bubble" of gas would ignite with a minor boom [actually a low energy explosion]. Flame would momentarily shoot out of the burner chamber opening, and from that point the furnace would operate normally until the next restart cycle.

Although there could be several causes, I suspect that the symptoms you describe are the result of DELAYED IGNITION of some or all of the main burners.

IF this is the problem, then the solution is to clean all the burners [including the burner outlet holes in the ignition ends of the burners], clean out the burner compartment, AND properly adjust the orientation of whatever system [you have to evaluate how it works from analysis of YOUR furnace] your furnace has to ensure all burners ignite as close to the same time as possible.

When operating properly, the ignition should be a smooth transition, burner by burner, from the pilot to the farthest burners. In other words. the ignition will "flow" from the pilot outward to each adjacent burner until the farthermost ends ignite last. This usually doesn't take more than one or two seconds at the most.

Unless you are an experienced handyman, and understand this analysis and instructions, I strongly suggest that you engage the services of a professional furnace technician.

Posted on Feb 14, 2009


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You are dealing with a dangerouse situation.
It is always reccomended that a qualified service technician perform repairs when dealing with gas.

When burners and ignitors get clogged with rust, dirt, grease, etc, they prevent the proper flow of gas across the ignition device. That results in gas build up, and instead of emediate ignition, you have literally a mini explosion from all the gas that is built up igniting at one time. This will only get worse as things get dirtier.

Hypothetically, if you were to do the repairs yourself, you would shut off the gas, remove the burners and clean them thouroghly with a wire brush making sure that the burners orifices are free of rust, dirt, grease, etc. You would clean the ignitors and flame sensors being carefull not to crack them.

You would then reassemble them, turn the gas back on, check for leaks, and carefully start the ignition sequence. You would be watching to make sure that the ignition is going properly and not building up gas to cause another potential mini explosion.

You would find that air may have gotten into the lines and needed to be bled out. (that would mean waitng a little for the egnition sequence to push out the air and start delivering gas.)

Agin, it is recomneded that a qualified tech do this. But like in our hypothetical situation, if a homeowner were to try it, after they had cleaned and reassembled the unit, they would be wise to smell for gas fumes and be ready to turn the gas of and seek proffesional help if they started to smell a lot of gas. They would also be wise to leave a window open and have a fire extinquisher handy for safety purposes.

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Explosion potential

Absolutely do not use it until the problem is taken care of. You do indeed have an explosion hazzard.

95% chance all it needs is a thourouch cleaning of the ignition assembly.

When burner orifices and lighting tracks get contaminated and partially clogged with rust, dirt, and other sediment it starts to block the gas flow.

The gas starts to build up unburnt untill it eventually encounters the flame or ignitor, and then all the built up gas ignites at once.

It would eventuallty get worse.

Clean or replace the ignition assembly and burners.
A brass wire brush works wonders.

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